Re: Square to sine wave

On Sun, 09 Jul 2006 02:28:54 GMT, "west" <restccq2@xxxxxxxxxxx> wrote:

I have an inverter that puts out a nice 120v square wave. The inverters that
put out a pure sine wave are expensive. Does anyone know where I can obtain
schematics to build a square to sine wave converter fo my inverter? Thanks
in advance.
Cordially,
west

This is a question more often asked at alt.energy.homepower or
alt.energy.renewable.
Basically there is NO simple circuit that I know of to achieve what
you want (I have tried for some time to do it).
You can HELP to round the corners of the wave with inductors and
capacitors - and maybe even a transformer which is inductive.
However, unless you had one FIXED load (in which case you could
approximate a sine wave by using the right filter), it isn't really
possible.
At the moment I am in the process of trying to find a cheap
oscilliscope, so that I can see what effect various filters have on
varying loads from a 230v modified square wave inverter.
I shall feel happier about running my new fridge (with its
electronics!) if I can make the wave at least closer to a sine wave,
with less harmonics, and "sharp edges" to the waveform.

I shall put out another message if I achieve anything - but it may be
some time before I find the oscilliscope that I need (at the right
price :) )

Best wishes

Eric Sears.

.

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